DocumentCode
1239537
Title
Extremely Low Frequency (ELF) Propagation Measurements Along a 4900-km Path
Author
Ginsberg, Lawrence H.
Author_Institution
Center for Naval Analyses, Arlington
Volume
22
Issue
4
fYear
1974
fDate
4/1/1974 12:00:00 AM
Firstpage
452
Lastpage
457
Abstract
Extremely low frequency (ELF) electromagnetic wave propagation was investigated by measuring the amplitude of a CW signal transmitted from the Sanguine site in North Carolina to receiving sites located in New York State, Labrador, and Iceland. The attenuation factor α and the reciprocal of the excitation factor 
were determined. Data for daytime, nighttime, and sunrise transition paths were obtained. The attenuation factors obtained for 78 and 156 Hz are compared with the value of α obtained from measurements of atmospherics. The attenuation values at 78 Hz of 1.29 and 1.01 dB/1000 km, and a value of 0.75 dB/1000 km at 45 Hz, obtained by interpolation of results of this and other experiments, were used in Sanguine systems analysis.
were determined. Data for daytime, nighttime, and sunrise transition paths were obtained. The attenuation factors obtained for 78 and 156 Hz are compared with the value of α obtained from measurements of atmospherics. The attenuation values at 78 Hz of 1.29 and 1.01 dB/1000 km, and a value of 0.75 dB/1000 km at 45 Hz, obtained by interpolation of results of this and other experiments, were used in Sanguine systems analysis.Keywords
ELF propagation; Antenna accessories; Antenna measurements; Antennas and propagation; Attenuation; Directive antennas; Equations; Frequency measurement; Geophysical measurement techniques; Ground penetrating radar; Magnetic field measurement;
fLanguage
English
Journal_Title
Communications, IEEE Transactions on
Publisher
ieee
ISSN
0090-6778
Type
jour
DOI
10.1109/TCOM.1974.1092218
Filename
1092218
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